/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.tools.datasource.dao;

import java.sql.SQLException;
import java.util.Objects;

import org.apache.dolphinscheduler.common.utils.ConnectionUtils;

import org.apache.commons.lang3.StringUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Joiner;
import com.google.common.base.Strings;

/**
 * resource dao
 */
public class ResourceDao {
  public static final Logger logger = LoggerFactory.getLogger(ResourceDao.class);

  /**
   * list all resources
   *
   * @param conn connection
   * @return map that key is full_name and value is id
   */
  Map<String, Integer> listAllResources(Connection conn) {
    Map<String, Integer> resourceMap = new HashMap<>();

    String sql = String.format("SELECT id,full_name FROM t_ds_resources");
    ResultSet rs = null;
    PreparedStatement pstmt = null;
    try {
      pstmt = conn.prepareStatement(sql);
      rs = pstmt.executeQuery();

      while (rs.next()) {
        Integer id = rs.getInt(1);
        String fullName = rs.getString(2);
        resourceMap.put(fullName, id);
      }

    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      throw new RuntimeException("sql: " + sql, e);
    } finally {
      ConnectionUtils.releaseResource(rs, pstmt, conn);
    }

    return resourceMap;
  }

  /**
   * list all resources by the type
   *
   * @param conn connection
   * @return map that key is full_name and value is the folder's size
   */
  private Map<String, Long> listAllResourcesByFileType(Connection conn, int type) {
    Map<String, Long> resourceSizeMap = new HashMap<>();

    String sql = String.format("SELECT full_name, type, size, is_directory FROM t_ds_resources where type = %d", type);
    ResultSet rs = null;
    PreparedStatement pstmt = null;
    try {
      pstmt = conn.prepareStatement(sql);
      rs = pstmt.executeQuery();

      while (rs.next()) {
        String fullName = rs.getString("full_name");
        Boolean isDirectory = rs.getBoolean("is_directory");
        long fileSize = rs.getLong("size");

        if (StringUtils.isNotBlank(fullName) && !isDirectory) {
          String[] splits = fullName.split("/");
          for (int i = 1; i < splits.length; i++) {
            String parentFullName = Joiner.on("/").join(Arrays.copyOfRange(splits, 0, splits.length - i));
            if (!Strings.isNullOrEmpty(parentFullName)) {
              long size = resourceSizeMap.getOrDefault(parentFullName, 0L);
              resourceSizeMap.put(parentFullName, size + fileSize);
            }
          }
        }
      }
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      throw new RuntimeException("sql: " + sql, e);
    } finally {
      if (Objects.nonNull(pstmt)) {
        try {
          if (!pstmt.isClosed()) {
            pstmt.close();
          }
        } catch (SQLException e) {
          logger.error(e.getMessage(), e);
        }
      }
    }
    return resourceSizeMap;
  }

  /**
   * update the folder's size
   *
   * @param conn connection
   */
  public void updateResourceFolderSizeByFileType(Connection conn, int type) {
    Map<String, Long> resourceSizeMap = listAllResourcesByFileType(conn, type);

    String sql = "UPDATE t_ds_resources SET size=? where type=? and full_name=? and is_directory = true";
    PreparedStatement pstmt = null;
    try {
      pstmt = conn.prepareStatement(sql);
      for (Map.Entry<String, Long> entry : resourceSizeMap.entrySet()) {
        pstmt.setLong(1, entry.getValue());
        pstmt.setInt(2, type);
        pstmt.setString(3, entry.getKey());
        pstmt.addBatch();
      }
      pstmt.executeBatch();
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      throw new RuntimeException("sql: " + sql, e);
    } finally {
      if (Objects.nonNull(pstmt)) {
        try {
          if (!pstmt.isClosed()) {
            pstmt.close();
          }
        } catch (SQLException e) {
          logger.error(e.getMessage(), e);
        }
      }
      ConnectionUtils.releaseResource(conn);
    }
  }

}
